Knife and scissors sharpening device



16, 19'." E. w. LARK 5 KNIFE AND SCISSORS SHARPENING DEVICE Filed April4, 1946 3 a Fig. 1 2

INVENTOR.

Patented Nov. 1 6 1 948 UN iTED STATE- S PAT ENT OFF liCE 2,454,035KNIFE AND s'oIss'oRs snaae eume iiizv'i'ce Earl W.' (3lark,'-S*tt1ar t,l la. Application April- 4, ieisjserialnattadis oi.=s'-1- 2 14) 6Claims. i

My invention relates "to improvements in a knife and scissors sharpeningdevice and is intended primarilyto re-sharp'enblades which have beendulled in ordinary usage. In my invention I preferably use trapezoidallyshaped abrasive members and the main objects of my invention are: toguide the abrasive members by rollers or other suitable means which beardirectly on integral or prepared surfaces thereon thus eliminatingspecial holding means; another object is to provide individual springsfor each abrasive member so they may follow the contour of the knifeblade; a further object is to'provide means by which scissors blades maybe sharpened on these abrasive members.

I attain these and, other objects by mechanism illustrated in theaccompanying drawings, in

which: 7

Fig. 1 is a sectional elevation of the sharpening device taken on linei-l ofFig. 3.

Fig. 2 is an end elevation of the device.

Fig. 3 is a plan view of the knife sharpener.

Fig. 4 is a side elevation ofone of the abrasive members.

Fig. 5 is an end elevation of Fig. 4.

Fig. 6 is a side View of a guide roller showing the turned down necks orjournals.

The abrasive member in Figs. 4 and 5 is identical with that shown inFig. 1 excepting that friction reducing material la is applie'dto aportion of the members.

Similar numerals refer 'to throughout the several views.

The abrasive members i are made up ofabrasive particles held together bya suitable binder, they are made preferably trapezoidal in shape andguide rollers 55 which are journaled in frame sides '2 contact theparallel sides of the abrasive similar parts members i to form rollerguides which in conjunction with frame sides 2 which also act as guidespermit the abrasive members to be moved freely back and forth in adirection :parallel with their parallel sides. Abrasive members I may beused as shown in Fig. 1, however, I have found that, if a portion of theparallel sides and parallel faces of the abrasive members are given acoating of a paste made of Portland cement and water as indicated by la,Figs. 4 and 5, where the guiding means contacts the abrasive members,the coefficient of friction at these portions is greatly reduced and thewear on the guide rollers 5 and frame sides 2 are greatly lessened.Parts 3 form a base for the frame and rivets 4, which may be replaced bybolts, hold the members of the frame for the sharpening device together.

force for t'ension spring I.

jl-Ielicaltension s'piings l are attached 'atone'end "to frame b'ase bymeans of holes 32; and the omerenu contacts the abrasive memberstoyieldingly force same against stops 6. 'StbpslVare carried byframemembers zandmaybe-dupli- "cat'es of guide rollers 5. Thesefstop's .6contact the inclined rin-ding faces of thetrape'zoidally shaped abrasivemembers and to position the abrasive members that th'ek nife blade lL'asit is brougli'tf'downinknifie g ui'dingslots 211 into contact with' tneabrasive'nfembers, mayror cethe opposing abrasive 'me'nib'ers apart"against the "Afiber "knife Striking piece r: is provided "at thebo'ttomorkriifefguidirig slots Za 'so that knife blade "ll may *not strike any"metal part 'as it is drawn over theinclined grinding "faces of thefabrasive member's.

Knife igui'ding's'l'otsffiz' in fr'am'e "sides "Zare provided "on eachside of each abrasive member "to give 'ma xii'rliim guiding for the'linife"b1ade. "The closely spaced knife slots are particularl usefulwhen sharpeningthe curved'lportion of theblade 'near the point as thecurved :pornon iniay'be sharpened t0 'theeiitr'emepoirit whilepositioned in at least two kn'i'fe guiding slots. "In the drawings Ihave for simplicity in the drawin'gs'shown any two abrasive members.However, athird abrasive member may easily be added'b'y'le'ng'theningrivets '6 and providing'an additional side land-Tan additional spacer 3and glJide'rOHers E, stop and spring. With three abrasive members bettersharpening of thelblade may be obtained at'the-handle andatthe. pointend.

V For sharpening SCISSOIS jbIadGS-I iprovideslots 2b in the outsideframesides 2 and notchaway the middle frame side 2 as shown so thatoneleaf spring 9 may bevused to hold the scissors blade ill in slot "2b.Pins '-8 which may be duplicates of rollers' 5 hold spring-9 =in.place.

The maximum outward movement ofthe abrasive members as knife blade H isdrawn over the entire inclined grinding faces of the abrasive members isindicated by dot and dash lines at both outer and inner ends of themembers I.

In my improved sharpening device the abrasive members are easily removedto reverse same to expose a new grinding surface to the knife blade orto replace some by new abrasive members by releasing spring I from incontact with I.

The scissors blade guiding slot 21) is slightly inclined to give aslight rake to the cutting face and the scissors blade is sharpened bydrawing the blade through the slot 21) while exerting a slight downwardpressure on the abrasive member, substantially the same motion that isused when sharpening a knife blade.

What I claim is:

1. In a knife sharpener: a frame comprising a base havin a plurality ofupwardly extending portions, said upwardly extendin portions havingtransversely aligned vertical knife guiding slots; a plurality ofabrasive members disposed between adjacent pairs of said portions, saidmembers having guiding surfaces and inclined abrasive ends, and adjacentmembers disposed respectively with their abrasive ends in oppositeoblique relation to the guide slots and in planes which intersect at theplane of said slots; a plurality of rollers pivotally journaled in andbetween adjacent pairs of said portions and said rollers disposed tocontact the guiding surfaces of said abrasive members to form rollersupports and guides for said abrasive members for reciprocating movementthereon.

2. In a knife sharpener: a frame comprising a base having a plurality ofupwardly extending portions; a plurality of abrasive members disposedbetween said portions, said members having outwardly and upwardlyinclined abrasive faces and adjacent members disposed respectively withtheir abrasive faces in opposite oblique relation; a plurality ofrollers pivotally journaled in and between said portions and saidrollers disposed to form roller supports and guides for said abrasivemembers for reciprocatin movement of said members on said rollers.

3. In a knife sharpener: a frame comprising a base having a plurality ofupwardly extending portions; a plurality of abrasive members disposedbetween said portions, said members having outwardly and upwardlyinclined abrasive faces and adjacent members disposed respectively withtheir abrasive faces in opposite oblique relation; a plurality ofrollers pivotally journaled in and between said portions and saidrollers disposed to contact the said abrasive members and to form rollersupports and guides for the same for reciprocating movement of saidmembers on said rollers; said abrasive members having friction reducingmaterial applied thereon at points where the said supporting and guidingmeans contacts same.

4. In a knife sharpener which includes a plurality of pivotally mountedguide and supporting rollers: abrasive members carried on and guided bysaid guide rollers for reciprocating movement thereon, said abrasivemembers having their abrading surfaces respectively in planes whichintersect at an acute angle and with adjacent members oppositelydisposed; spring means urging the oppositely disposed members towardeach other to maintain contact of said abrasive members with oppositesides of a knife blade inserted between them; means providing a guideslot for the knife blade, said slot extending in a plane substantiallybisecting the angle made by the abrading surfaces of the oppositelydisposed abrasive members; stop means fixed relative to said guide slotto contact the abrasive members on their abrading surfaces to positionthe abrading surfaces at a predetermined relationship as said surfacesar worn by successive blade sharpening when said blade is not in saidknife slot.

5. In a knife sharpener: a frame comprising a base having a plurality ofupwardly extending portions, said upwardly extending portions havingtransversely aligned vertical knife guiding slots; a plurality ofabrasive members disposed between said portions, said members havingoutwardly and upwardly inclined abrasive faces and adjacent membersdisposed respectively with their abrasive faces in opposite obliquerelation to the guide slots and in planes which intersect at the planeof the knife guide slots; a plurality of rollers pivotally journaled inand between said portions, and said rollers disposed to contact and formroller guides and supports for said abrasive members for reciprocatingmovement of said members thereon; spring members contacting saidabrasive members and urging oppositely disposed abrasive members towardeach other; fixed stops contacting the inclined faces of said abrasivemembers to position the abrasive faces, when knife blade is not in knifeslot, at a predetermined relationship as said surfaces are worn bysuccessive blade sharpening,

6. In a knife sharpener: a frame comprising a base having a plurality ofupwardly extending portions, said upwardly extending portions havingtransversely aligned vertical knife guiding slots in said portions; anabrasive member disposed between said portions said member having anoutwardly and upwardly inclined abrasive face, the plane of whichintersects the plane of the guide slots; a plurality of rollerspivotally journaled in and between said portions and said rollersdisposed to form roller supports and guides for said abrasive membersfor reciprocating movement thereon.

EARL W. CLARK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,365,161 Eisenhauer Jan. 11,1921 1,570,083 Runzi Jan. 19, 1926 1,952,106 Vierling Mar. 2'7, 19342,092,443 Crossley Sept. 7, 1937 2,241,412 Meade et al May 13, 19412,249,218 Meade et al July 15, 1941 2,262,401 Meade et al. Nov. 11, 19412,398,711 Lambert Apr. 16, 1946

